Hole spotter



April'lZ, 1938. E. MERRILL 2,114,132

HOLE SPOTTER Filed April 7, 1957 2 Sheets-Sheet 1 Everett Merrill INVENTOR ATTORNEY April 12, 1938. E. MERRXLL 2,114,132

HOLE SPOTTER Filed April '7, 1-937 2 Sheets-Sheet 2 Everett Merrill IN ENTOR ATTORNEY Patented Apr. 12, 1938 PATENT OFFICE HOLE SPOTTER Everett Merrill, North Arlington, N. J., assignor to Worthington Pump and Machinery Corporation, New York, N. Y., a corporation of Delaware Application April 7, 1937, Serial No. 135,374

Claims.

This invention relates to rock drilling equipment and more'particularly to a hole spotter or centering device for holding and guiding drill steels during the starting of a drill hole.

5 In drilling rock with rock drills of the hammer piston percussive type, it has been the general practice in starting drill holes for the drill runners helper or helpers to hold the drill steel manually to steady it and get the drill hole started. This is not only expensive in that it requires the services of one or more helpers, but due to the vibration of the drill steel and the force of its vibration and movement taken together with the irregularity of the rock surface in which the drill hole is started is hazardous, often resulting in serious injury to the helper.

The present invention comprehends the provision of a hole spotter which is readily attachable to or detachable from a drilling machine, and which will hold a drill steel steady and true during the starting or spotting of a drill hole, thereby not only resulting in a savings due to the dispensing of the helper in such work, but removes the hazards to the helper.

An object of the present invention is to provide a hole spotter as specified which is simple in construction, may be used in connection with approved types of drilling machines now on the market, one which is inexpensive to manufacture, and one which may be easily and quickly moved out of drill steel guiding position after the drill hole has been started.

With these and other objects in View, as may appear from the accompanying specification. the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings, showing a hole spotter of the preferred 40 form embodying the invention, and the features forming the invention will be specifically pointed out in the claims.

In the drawings:

Figure 1 is a side elevation of the improved hole spotter showing it attached to a fragment of a drilling machine.

Figure 2 is a vertical section through the hole spotter and a part of the drilling machine and taken on the line 2-2 of Figure 4.

Figure 3 is a detail section through the hole spotter and a part of the drilling machine frame taken on the line 33 of Figure 2.

Figure 4 is an end elevation of the hole spotter.

Figure 5 is a top plan of the hole spotter.

Figure 6 is an end view of the hole spotter showing the end opposite to that shown in Figure 4.

Figure 7 is a horizontal section through the hole spotter taken on the line 1-4 and showing a part of the drilling machine frame in top plan.

' Referring more particularly to the drawings, the improved hole spotter forming the present invention is particularly adapted for attachment to various types of rock drilling machines embodying feeding means and guiding frames for 10 the movement of the rock drill proper, such as the machines shown in Patents Numbers 914,737

to Leyner, 709,022 to Leyner, and 1,690,359 to Gilman. The patents just quoted show rock drilling machines of certain types to which the hole spot- 16 ter is particularly adaptable, but it is to be understood that it may be used in connection with any approved type of drilling machine to which it is applicable without departing from the spirit of the present invention.

The improved hole spotter comprises a standard I which has a pair of oppositely disposed drill steel guiding members 2 and 3 formed integrally therewith. The drill steel guiding members are spaced laterally so as to engage upon opposite sides of a drill steel, indicated at A, and they are spaced longitudinally from each other a distance greater than the diameter of the drill steel A so that when it is desired to remove the hole spotter from drill steel guiding position it may be rotated 31 a quarter turn and moved downwardly off or from about the drill steel. The inner sides 4 of the drill steel guiding members 2 and 3 are preferably curved as clearly shown in Figures 4 and 6 of the drawings to conform to the curvature of the 35 drill steel and to provide a firm holding guide for the drill'steel during the spotting or starting of a drill hole.

The hole spotter is readily attachable to or detachable from a drilling machine of any ap 40 proved type, only a fragment of which is shown in certain of the drawings, and the lower end of the standard ,I is provided with an opening 5 extending therethrough which fits over a lug or pin 6 formed upon and extending forwardly from the forward end of the section 1 of the frame B of the rock drilling machine. The section 7 of the frame B of the rock drilling machine as shown in the drawings forms the support for the forward end of the feed screw 8 by means of which the rock drill proper indicated at C is manually fed to its work. The drawings show a rock drilling machine in which the rock drill C is fed manually to its work by means of the feed screw 8 as for instance the type of drilling machine shown in the two Leyner patents above referred to but it is to be understood that the hole spotter may be used with drilling machines embodying pneumatic feeds such as that shown in the Gilman patent above cited or any other approved types of drilling machines without departing from the spirit of the present invention.

The standard I has its lower end flattened, and it has laterally projecting extensions or lugs 9 and 10 formed thereon and which engage in recesses l l and I2 respectively cut in the member I of the frame B below and on opposite sides of the lug or pin 6. These extensions 9 and I engaging in the recesses I l and I2 prevent pivotal movement or wobbling of the hole spotter during the spotting or starting of a drill hole.

The standard i has a lug I l formed thereon to which a handle I is connected. The handle [5 is provided to facilitate the connection of and disconnection from a drilling machine of the hole spotter and also to permit an operator to grip it and hold the hole spotter steady during the starting of a drill hole.

When it is desired to mount the hole spotter on a drilling machine, the hole spotter is positioned forwardly of the bracket 1 and is moved so that the drill steel guiding members 2 and 3 are positioned at a substantially quarter turn from the position shown in Figure 5 of the drawings after which the hole spotter is rotated a quarter turn to move the members 2 and 3 into the drill steel guiding position as shown in Figures 1, 4, 5, and 6 of the drawings and the hole spotter is then moved rearwardly towards the rock drill C and upon the lug 6 with the extensions 9 and I0 engaging in the recesses I l and I2 at which time the hole spotter is in position for use.

After the drill hole has been drilled to a sufficient distance to remove the need of the hole spotter, it is moved forwardly off the pin 6, rotated a quarter turn to permit the members 2 and 3 to clear the drill steel, and then moved downwardly and away so as not to interfere with the continued drilling operation of the drilling machine.

The vibration of the drilling machine during operation may cause the hole spotter or drill steel guide to move off the lug 6, and to prevent such action a locking spring or member 20 is provided which is attached to the standard I in any suitable manner as at 2| and extends outwardly from the standard. The outer free end of the flat locking spring 20 is bent downwardly as shown at 22 for engagement over and against the end of the boss 8 which supports the end of the feed screw 8. A releasing thumb piece 23 is provided on the locking spring for releasing it from locking engagement with the boss 8' when it is desired to remove the hole spotter from attachment to the drilling machine.

t will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that they may be widely modified within the invention defined by the claims.

What is claimed is:

1. In a hole spotter for rock drilling machines,

the combination with a rock drilling machine including a frame, of a lug on the forward end of said frame, a standard, drill steel guiding members on said standard, said standard provided with an opening for receiving said lug, said frame provided with spaced recesses therein and lugs on said standard for engagement in said recesses to prevent pivotal movement of the standard relative to the frame.

2. In a hole spotter for rock drill machines, the combination with a drilling machine including a frame having recesses in its forward end, a lug on the forward end of the frame between said recesses, a standard, drill steel guiding members on said standard, said standard provided with an opening for receiving said lug, means on said standard for engagement in said recesses to prevent pivotal movement of the standard relative to the frame, and means for locking said standard against accidental movement relative to said frame.

3. In a hole spotter for a rock drilling machine, the combination with a drilling machine including a frame having recesses in its forward end, a lug on the forward end of the frame between said recesses, a standard, drill steel guiding members on said standard, said standard provided with an opening for receiving said lug, extensions formed on said standard for engagement in said recesses to prevent pivotal movement of said standard relative to the frame, said drill steel guiding members being formed integrally with said standard and spaced laterally for engagement on opposite sides of a drill steel and spaced longitudinally from each other a distance in ex cess of the diameter of a drill steel to permit them to be moved clear of a drill.

4. In a hole spotter for rock drilling machines, the combination with a rock drilling machine including a frame, of a lug on the forward end of said frame, a standard, drill steel guiding mem bers on said standard, said standard provided with an opening for receiving said lug, means on said standard for engagement with said frame to prevent pivotal movement of the standard relative to the frame, and a spring latch carried by said standard for engagement with said frame.

5. In a hole spotter for a rock drilling machine, the combination with a drilling machine including a frame having spaced recesses in its forward end, a lug on the forward end of the frame between said recesses, a standard, drill steel guiding members on said standard, said standard provided with an opening for receiving said lug, extensions formed on said standard for engagement in said recesses to prevent pivotal movement of said standard relative to the frame, said drill steel guiding members being formed integrally with said standard and spaced laterally for engagement on opposite sides of a drill steel and space-d longitudinally from each other a distance in excess of the diameter of a drill steel to permit them to be moved clear of a drill, and a spring latch carried by said standard for engagement with said frame.

EVERETT MERRILL. 

